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Gardening Answers Knowledgebase

Plant Answer Line Question

Keywords: Verticillium, Plant diseases--Diagnosis, Acer

I want to test the roots of our Japanese Maple for Verticillium wilt. Are there places which could test for that?


There is information about Verticillium wilt and how to manage it on the Washington State University Extension's HortSense website.

To have a sample from your Japanese maple diagnosed, you can take samples to a free Master Gardener Clinic, or you can send samples (for a fee) to WSU Puyallup Research and Extension Center:
go to "How to Submit a Sample," scroll down to "Plant Problem Diagnosis," then you can download a form by clicking on "Form C1006."

My personal experience with this disease is that the Japanese maple lived with it for quite a few years before totally succumbing, at which point we had it removed by an arborist.

Date 2017-06-09
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Garden Tip

Keywords: Biofumigation, Quercus alba, Malus sylvestris, Verticillium, Ginkgo biloba, Liquidambar, Katsura, Fraxinus, Pseudotsuga menziesii, Malus domestica

Don't despair if verticillium wilt lives in your garden's soil because there are many resistant plants. A few verticillium-resistant trees include Apple and Crabapple, Mountain Ash, Ginkgo, Sweet Gum, Katsura, Douglas Fir, Arborvitae and White Oak. A long list of susceptible and resistant trees, shrubs, perennials and vegetables.

There is some evidence that broccoli (chopped up new shoots worked into the soil) can act as a soil fumigant, if added to the soil before planting. Studies were done by Krishna Subbarao at University of California, Davis, and showed reduced incidence of wilt in cauliflower crops where broccoli had been planted and its residue added to the soil.

Date: 2007-05-23
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May 16 2018 11:15:37